https://github.com/eclipse/eclipse-collections/eclipse-collections: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
final class org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction<V, K> implements org.eclipse.collections.api.block.function.Function<V, org.eclipse.collections.api.tuple.Pair<K, V>>
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction
  super_class: java.lang.Object
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  private final K key;
    descriptor: Ljava/lang/Object;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: TK;

  private void <init>();
    descriptor: (Ljava/lang/Object;)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction this
        start local 1 // java.lang.Object key
         0: .line 242
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 244
            aload 0 /* this */
            aload 1 /* key */
            putfield org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction.key:Ljava/lang/Object;
         2: .line 245
            return
        end local 1 // java.lang.Object key
        end local 0 // org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/eclipse/collections/impl/multimap/AbstractMultimap$KeyValuePairFunction<TV;TK;>;
            0    3     1   key  TK;
    Signature: (TK;)V
    MethodParameters:
      Name  Flags
      key   

  public org.eclipse.collections.api.tuple.Pair<K, V> valueOf(V);
    descriptor: (Ljava/lang/Object;)Lorg/eclipse/collections/api/tuple/Pair;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction this
        start local 1 // java.lang.Object value
         0: .line 250
            aload 0 /* this */
            getfield org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction.key:Ljava/lang/Object;
            aload 1 /* value */
            invokestatic org.eclipse.collections.impl.tuple.Tuples.pair:(Ljava/lang/Object;Ljava/lang/Object;)Lorg/eclipse/collections/api/tuple/Pair;
            areturn
        end local 1 // java.lang.Object value
        end local 0 // org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lorg/eclipse/collections/impl/multimap/AbstractMultimap$KeyValuePairFunction<TV;TK;>;
            0    1     1  value  TV;
    Signature: (TV;)Lorg/eclipse/collections/api/tuple/Pair<TK;TV;>;
    MethodParameters:
       Name  Flags
      value  

  public java.lang.Object valueOf(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=2, locals=2, args_size=2
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.Object
            invokevirtual org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction.valueOf:(Ljava/lang/Object;)Lorg/eclipse/collections/api/tuple/Pair;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <V:Ljava/lang/Object;K:Ljava/lang/Object;>Ljava/lang/Object;Lorg/eclipse/collections/api/block/function/Function<TV;Lorg/eclipse/collections/api/tuple/Pair<TK;TV;>;>;
SourceFile: "AbstractMultimap.java"
NestHost: org.eclipse.collections.impl.multimap.AbstractMultimap
InnerClasses:
  private final KeyValuePairFunction = org.eclipse.collections.impl.multimap.AbstractMultimap$KeyValuePairFunction of org.eclipse.collections.impl.multimap.AbstractMultimap